Reportedly involved 'improvised explosive device at Downing Street'

Two men have been charged with terrorism-related offenses in connection with the plot, which reportedly involved using improvised explosives to blow up the gate at No. 10 Downing Street, the prime minister’s residence, and to kill May in the ensuing chaos, various media say.

London Attack Highlights Efforts To Combat Homegrown Terrorism June 5, 2017
The men, who Sky News said were arrested last week, were scheduled to appear on Wednesday in Westminster Magistrates’ Court, according to The Telegraph, which said the information was provided on Tuesday in a briefing by Andrew Parker, the head of MI5.